Exception when running on Hudson

An exception occurred while parsing the file: System.NullReferenceException, Object reference not set to an instance of an object. at System.StringExtensions.SubstringAfterLast(String s, Char c) at StyleCop.StyleCopThread.ParseAndAnalyzeDocument(SourceCode
sourceCode, DocumentAnalysisStatus documentStatus) at StyleCop.StyleCopThread.DoWork(Object sender). (SA0001)